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. 2017 Apr 28;17:61. doi: 10.1186/s12886-017-0453-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — The results of tear break up time (TBUT) in Group 1 (NPT → PT) and Group 2 (PT → NPT). Comparison between baseline TBUT and after 12 months of treatment showed a slightly decreased TBUT in Group 1 (NPT → PT). (p = 0.06)